It might not be a health issue, it could have something to do with the population dynamics of your area i.e. buck:doe ratio. Too many bucks and not enough does could lead to excessive sparring and fighting for the right to mate. I'm not sure what the deer density or buck:doe ratio are like in your area, but this could be playing a factor. That being said, I have never heard of a food plot harming a deer herd, so if you have the means and money, go for it. Check out the Wildlife Management forum on here, it's basically a food plot forum.